A photonic circuit implementing ten frequency reference filters for narrow-channel wavelength division multiplexing (WDM) has been fabricated. A diluted multiquantum-well waveguide structure is shown to yield a very low TE/TM polarization dependence of 1 A, as well as improved absolute frequency control and reproducibility. A standard deviation in absolute filter wavelength of 333 A is measured on a random set of devices from a 2 in wafer. The ten channels are evenly spaced by 7.2 A. Such filters can be used to lock tunable lasers to a set of reference frequencies for WDM Applications. The demonstrated diluted multiquantum-well waveguide structure with low birefringence and improved absolute wavelength control could potentially be used in other WDM integrated circuit requiring tight wavelength tolerance and polarization insensitivity.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Electrical and Electronic Engineering